<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <meta http-equiv="Content-Language" content="en-ca" />
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <meta name="description" content="Expressions" />
        <link rel="stylesheet" type="text/css" href="../style.css" />
        <title>NAnt - Expressions</title>
    </head>
    <body>
        <table width="100%" border="0" cellspacing="0" cellpadding="2" class="NavBar">
            <tr>
                <td class="NavBar-Cell">
                    <a title="NAnt home page" href="http://nant.sourceforge.net"><b>NAnt</b></a> <img src="../images/arrow.gif" alt="-&gt;" width="13" height="9" />
                    <a href="../index.html">Help</a> <img alt="-&gt;" src="../images/arrow.gif" /> <a href="index.html">
                        Fundamentals</a> <img height="9" alt="-&gt;" src="../images/arrow.gif" width="13" />
                    Expressions
                </td>
                <td class="NavBar-Cell" align="right">
                    v0.85
                </td>
            </tr>
        </table>
        <h1>Expressions</h1>
        
        <h2><a id="contents" />Contents</h2>
        <div>
            1 <a href="#introduction">Introduction</a><br />
            2 <a href="#expression-syntax">Expression syntax</a><br />
            3 <a href="#datatypes">Data types</a><br />
            4 <a href="#operators">Operators</a>
            <div style="margin-left: 20px;">
                4.1 <a href="#operator-precedence">Operator precedence</a><br/>
                4.2 <a href="#numeric-operators">Operators on Numeric Values</a>
                <div style="margin-left: 20px;">
                    4.2.1 <a href="#op-num-add">Add</a><br />
                    4.2.2 <a href="#op-num-subtract">Subtract</a><br />
                    4.2.3 <a href="#op-num-multiply">Multiply</a><br />
                    4.2.4 <a href="#op-num-divide">Divide</a><br />
                    4.2.5 <a href="#op-num-mod">Mod</a><br />
                    4.2.6 <a href="#op-num-equal">Equal</a><br />
                    4.2.7 <a href="#op-num-inequal">Inequal</a><br />
                    4.2.8 <a href="#op-num-greater-than">Greater than</a><br />
                    4.2.9 <a href="#op-num-greater-than-or-equal">Greater than or equal</a><br />
                    4.2.10 <a href="#op-num-less-than">Less than</a><br />
                    4.2.11 <a href="#op-num-less-than-or-equal">Less than or equal</a><br />
                    4.2.12 <a href="#op-num-unary-plus">Unary plus</a><br />
                    4.2.13 <a href="#op-num-unary-minus">Unary minus</a>
                </div>
            </div>
            <div style="margin-left: 20px;">
                4.3 <a href="#boolean-operators">Operators on Boolean Values</a>
                <div style="margin-left: 20px;">
                    4.3.1 <a href="#op-boolean-equal">Equal</a><br />
                    4.3.2 <a href="#op-boolean-inequal">Inequal</a><br />
                    4.3.3 <a href="#op-boolean-greater-than">Greater than</a><br />
                    4.3.4 <a href="#op-boolean-greater-than-or-equal">Greater than or equal</a><br />
                    4.3.5 <a href="#op-boolean-less-than">Less than</a><br />
                    4.3.6 <a href="#op-boolean-less-than-or-equal">Less than or equal</a><br />
                    4.3.7 <a href="#op-boolean-logical-and">Logical and</a><br />
                    4.3.8 <a href="#op-boolean-logical-or">Logical or</a><br />
                </div>
            </div>
            <div style="margin-left: 20px;">
                4.4 <a href="#string-operators">Operators on String Values</a>
                <div style="margin-left: 20px;">
                    4.4.1 <a href="#op-string-concat">Concat</a><br />
                    4.4.2 <a href="#op-string-equal">Equal</a><br />
                    4.4.3 <a href="#op-string-inequal">Inequal</a><br />
                    4.4.4 <a href="#op-string-greater-than">Greater than</a><br />
                    4.4.5 <a href="#op-string-greater-than-or-equal">Greater than or equal</a><br />
                    4.4.6 <a href="#op-string-less-than">Less than</a><br />
                    4.4.7 <a href="#op-string-less-than-or-equal">Less than or equal</a><br />
                </div>
            </div>
            <div style="margin-left: 20px;">
                4.5 <a href="#datetime-operators">Operators on TimeSpan and DateTime Values</a>
                <div style="margin-left: 20px;">
                    4.5.1 <a href="#op-datetime-add">Add</a><br />
                    4.5.2 <a href="#op-datetime-subtract">Subtract</a><br />
                    4.5.3 <a href="#op-datetime-equal">Equal</a><br />
                    4.5.4 <a href="#op-datetime-inequal">Inequal</a><br />
                    4.5.5 <a href="#op-datetime-greater-than">Greater than</a><br />
                    4.5.6 <a href="#op-datetime-greater-than-or-equal">Greater than or equal</a><br />
                    4.5.7 <a href="#op-datetime-less-than">Less than</a><br />
                    4.5.8 <a href="#op-datetime-less-than-or-equal">Less than or equal</a><br />
                </div>
            </div>
        </div>
        <h2><a id="introduction" />1 Introduction</h2>
        <p>Expressions are simple, yet powerful mechanism that allows you to write advanced 
            formulas to be used in task arguments and conditions that direct the build 
            process. Expressions can access project <a href="properties.html">properties</a>
            and call builtin or user-defined <a href="../functions/index.html">functions</a>.</p>
        <p>
        NAnt provides a rich set of bulitin functions, that allow you to:</p>
        <ul>
            <li>
                manipulate strings</li>
            <li>
                manipulate date/time values</li>
            <li>
                manipulate path names</li>
            <li>
                read the properties of files/directories</li>
            <li>
                access current build information and more</li>
            <li>
                and more</li>
        </ul>
        <p>For a full list of supported functions, click <a href="../functions/index.html">here</a>.</p>
        <h2><a id="expression-syntax" />2 Expression Syntax</h2>
        <p>Expressions can be used in all task arguments, by using <code>${...}</code> notation. 
            You may use standard syntax for arithmetical (addition, subtraction, 
            multiplication, division, modulus), logical (negation, conjunction, 
            alternative) and relational operators (equality, inequality). To call 
            functions, use <code>prefix::function-name(argument1, ..., argumentN)</code> syntax. 
            To access properties, you simply use their names without any prefix or suffix. 
            See the examples section below for more information.</p>
        <p><b>NOTE</b>: Expressions are often used in XML attributes. The grammar specified in this 
            section applies to the attribute value after XML 1.0 normalization. So, for 
            example, if the grammar uses the character <code>&lt;</code>, this must not 
            appear in the XML source as <code>&lt;</code> but must be quoted according to 
            XML 1.0 rules by, for example, entering it as <code>&amp;lt;</code>.
        </p>
        <h3>Examples:</h3>
        <ol>
            <li>
                Accessing a property:
                <p>
                    <code>&lt;property name="build.version" value="3" /&gt;</code><br />
                    <code>&lt;echo message="The current date is:
                        <span class="expression">${build.version}</span>" /&gt;</code>
                </p>
                <p>This will output the current value of <code>build.version</code> property.</p>
            </li>
            <li>
                Calling a function
                <p>
                    <code>&lt;echo message="The current date is:
                        <span class="expression">${<a href="../functions/datetime.now.html">datetime::now</a>()}</span>" 
                        /&gt;</code>
                </p>
                <p>This will output the current date and time.</p>
            </li>
            <li>
                Storing the result of an expression
                <p>To store the result of an expression in a property, use the <code>&lt;property&gt;</code>
                    task:</p>
                <p>
                    <code>&lt;property name="autoexec-present" value="<span class="expression">${<a href="../functions/file.exists.html">file::exists</a>('c:\autoexec.bat')}</span>" 
                        /&gt;</code>
                </p>
                <p>This will set the property <code>autoexec-present</code> to either <b>true</b>
                    or <b>false</b> depending on whether the specified file exists or not.</p>
            </li>
            <li>
                Real-life expression use
                <p>
                    <code>&lt;property name="myprj.basedir" value="c:\" /&gt;<br />
                        &lt;property name="filename" value="<span class="expression">${<a href="../functions/path.combine.html">path::combine</a>(myprj.basedir,'version.txt')}</span>" 
                        /&gt;<br />
                        <br />
                        &lt;if test="<span class="expression">${not <a href="../functions/file.exists.html">file::exists</a>(filename) or <a href="../functions/file.get-length.html">file::get-length</a>(filename) = 0}</span>"&gt;<br />
                        &nbsp;&nbsp;&nbsp;&nbsp;&lt;echo message="The version file
                        <span class="expression">${filename}</span>
                        doesn't exist or is empty!" /&gt;<br />
                        &lt;/if&gt;<br/> </code>
                </p>
                <p>This will check for the existence of a file <i>version.txt</i>
                in a directory specified by myprj.basedir. Note that this makes use of the 
                short-circuit evaluation supported by NAnt, so you can test for the existence 
                of the file and check its length in the same expression. ( ie like C, NAnt will 
                not evaluate the second part of an 'or' expression if the first evaluates to 
                <b>true</b> )
                </p>
            </li>
            <li>
                Using expressions to conditionally execute tasks
                <p>All tasks support <code>if</code> and <code>unless</code> attributes. 
                    Expressions can be used there to control which tasks get executed:</p>
                <p>
                    <code>&lt;property name="myprj.basedir" value="c:\" unless="<a href="../functions/property.exists.html">property::exists</a>('myprj.basedir')" 
                        /&gt;<br />
                        &lt;csc target="library" output="out.dll" ...
                        <br />
                        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if="<span class="expression">${<a href="../functions/datetime.now.html">datetime::now</a>() - <a href="../functions/file.get-last-write-time.html">file::get-last-write-time</a>('out.dll')) &gt; <a href="../functions/timespan.from-hours.html">timespan::from-hours</a>(1)}</span>"&gt;<br />
                        ...<br />
                        &lt;/csc&gt;<br />
                    </code>
                </p>
                <p>
                    This will rebuild the C# library only if it was last rebuilt more than an hour 
                    ago.
                </p>
            </li>
        </ol>
        <h2><a id="datatypes" />3 Data types</h2>
        <p>Expressions can access, pass and return values of the following types:</p>
        <div class="table">
            <table>
                <tr>
                    <th>
                        Type</th>
                    <th>
                        Allowed values</th>
                </tr>
                <tr>
                    <td>int</td>
                    <td>32-bit signed integer value</td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>64-bit signed integer value</td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>64-bit signed double precision floating point value</td>
                </tr>
                <tr>
                    <td>boolean</td>
                    <td><b>true</b> or <b>false</b></td>
                </tr>
                <tr>
                    <td>string</td>
                    <td>strings of characters of any length.</td>
                </tr>
                <tr>
                    <td>datetime</td>
                    <td>values represeting date &amp; time (range is from 00:00:00, January 1, 1 AD to 
                        23:59:59, December 31, 9999 AD)</td>
                </tr>
                <tr>
                    <td>timespan</td>
                    <td>represents a time interval.</td>
                </tr>
            </table>
        </div>
        <p>In addition, the expression evaluation engine allows you to return and pass 
            values of any CLI type through the use of <a href="functions.html#custom">custom 
                functions</a>. Note that there's no support for implicit type conversions.</p>
        <h2><a id="operators" />4 Operators</h2>
        <h3><a id="operator-precedence" />4.1 Operator precedence</h3>
        <p>NAnt expressions support standard ( c style ) operator precedence, that we're 
            accustomed to:</p>
        <ul>
            <li>
                <code>and</code> is evaluated before <code>or</code>, left to right. For 
                example <code>false or true and true and false</code> evaluates as <code>false or 
                    ((true and true) and false)</code></li>
            <li>
                multiplication,division and modulus are evaluated before addition and 
                subtraction, left to right. For example <code>1 + 2 * 3 / 4</code> evaluates as <code>
                    1 + ((2 * 3) / 4)</code></li>
            <li>
                parentheses can be used to override the default operator precedence. For 
                example <code>(1 + 2) * 3</code> evaluates as written, even though the 
                multiplication has precedence over addition</li>
        </ul>
        <p><b>NOTE</b>: Because NAnt supports properties whose names can contain dashes, 
            there's a possible ambiguity between the subtraction of two properties and 
            accessing a single property with a name containing a dash:</p>
        <p>
        <code>aaa-bbb</code> - this is ambiguous. It could either be <span style="text-decoration: underline;">property <code>aaa</code>
            MINUS property <code>bbb</code></span> or <span style="text-decoration: underline;">property <code>aaa-bbb</code></span>.</p>
        <p>To avoid confusion, it's recommended to surround the subtraction operator (or 
            even better, all binary operators) with spaces. The expression <code>aaa - bbb</code>
            always evaluates as a subtraction.</p>
        <h3><a id="numeric-operators" />4.2 Operators on Numeric Values</h3>
        <p>The following operators are supported on numeric values:</p>
        <ul>
            <li>
                + operator
            </li>
            <li>
                - operator
            </li>
            <li>
                * operator
            </li>
            <li>
                / operator
            </li>
            <li>
                % operator
            </li>
            <li>
                == operator
            </li>
            <li>
                != operator
            </li>
            <li>
                > operator
            </li>
            <li>
                >= operator
            </li>
            <li>
                &lt; operator
            </li>
            <li>
                &lt;= operator
            </li>
            <li>
                unary plus
            </li>
            <li>
                unary minus (negation)
            </li>
        </ul>
        <h4><a id="op-num-add" />4.2.1 Add</h4>
        <h5>Summary</h5>
        <p>
            Returns the arithmetic sum of its operands.
        </p>
        <h5>Operands</h5>
        <div class="table">
            <table>
                <colgroup>
                    <col />
                    <col />
                    <col />
                </colgroup>
                <tr>
                    <th>
                        Left Operand</th>
                    <th>
                        Right Operand</th>
                    <th>
                        Example</th>
                </tr>
                <tr>
                    <td>int</td>
                    <td>int</td>
                    <td>
                        <code>1 + 5</code> evaluates to <code>6</code>
                    </td>
                </tr>
                <tr>
                    <td>int</td>
                    <td>long</td>
                    <td>
                        <code>1 + 6666666667</code> evaluates to <code>6666666668</code>
                    </td>
                </tr>
                <tr>
                    <td>int</td>
                    <td>double</td>
                    <td>
                        <code>1 + 5.0</code> evaluates to <code>6.0</code>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>long</td>
                    <td>
                        <code>6666666667 + 11111111111</code> evaluates to <code>17777777778</code>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>int</td>
                    <td>
                        <code>6666666667 + 1</code> evaluates to <code>6666666668</code>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>double</td>
                    <td>
                        <code>6666666667 + 1.5</code> evaluates to <code>6666666668.5</code>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>double</td>
                    <td>
                        <code>1.5 + 5.0</code> evaluates to <code>6.5</code>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>int</td>
                    <td>
                        <code>1.0 + 5</code> evaluates to <code>6.0</code>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>long</td>
                    <td>
                        <code>1.5 + 6666666667</code> evaluates to <code>6666666668.5</code>
                    </td>
                </tr>
            </table>
        </div>
        <h4><a id="op-num-subtract" />4.2.2 Subtract</h4>
        <h5>Summary</h5>
        <p>
            Returns the arithmetic difference of its operands.
        </p>
        <h5>Operands</h5>
        <div class="table">
            <table>
                <colgroup>
                    <col />
                    <col />
                    <col />
                </colgroup>
                <tr>
                    <th>
                        Left Operand</th>
                    <th>
                        Right Operand</th>
                    <th>
                        Example</th>
                </tr>
                <tr>
                    <td>int</td>
                    <td>int</td>
                    <td>
                        <code>5 - 1</code> evaluates to <code>4</code>
                    </td>
                </tr>
                <tr>
                    <td>int</td>
                    <td>long</td>
                    <td>
                        <code>5 - 6666666667</code> evaluates to <code>-6666666662</code>
                    </td>
                </tr>
                <tr>
                    <td>int</td>
                    <td>double</td>
                    <td>
                        <code>5.0 - 1</code> evaluates to <code>4.0</code>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>long</td>
                    <td>
                        <code>11111111111 - 6666666667</code> evaluates to <code>4444444444</code>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>int</td>
                    <td>
                        <code>6666666667 - 5</code> evaluates to <code>6666666662</code>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>double</td>
                    <td>
                        <code>6666666667 - 1.5</code> evaluates to <code>6666666665.5</code>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>double</td>
                    <td>
                        <code>5.0 - 1.0</code> evaluates to <code>4.0</code>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>int</td>
                    <td>
                        <code>5.0 - 1</code> evaluates to <code>4.0</code>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>long</td>
                    <td>
                        <code>1.5 - 6666666667</code> evaluates to <code>-6666666665.5</code>
                    </td>
                </tr>
            </table>
        </div>
        <h4><a id="op-num-multiply" />4.2.3 Multiply</h4>
        <h5>Summary</h5>
        <p>
            Returns the arithmetic product of its operands.
        </p>
        <h5>Operands</h5>
        <div class="table">
            <table>
                <colgroup>
                    <col />
                    <col />
                    <col />
                </colgroup>
                <tr>
                    <th>
                        Left Operand</th>
                    <th>
                        Right Operand</th>
                    <th>
                        Example</th>
                </tr>
                <tr>
                    <td>int</td>
                    <td>int</td>
                    <td>
                        <code>5 * 2</code> evaluates to <code>10</code>
                    </td>
                </tr>
                <tr>
                    <td>int</td>
                    <td>long</td>
                    <td>
                        <code>2 * 6666666667</code> evaluates to <code>13333333334</code>
                    </td>
                </tr>
                <tr>
                    <td>int</td>
                    <td>double</td>
                    <td>
                        <code>5 * 2.0</code> evaluates to <code>10.0</code>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>long</td>
                    <td>
                        <code>6666666667 * long::parse('2')</code> evaluates to <code>13333333334</code>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>int</td>
                    <td>
                        <code>6666666667 * 2</code> evaluates to <code>13333333334</code>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>double</td>
                    <td>
                        <code>6666666667 * 1.7</code> evaluates to <code>11333333333.9</code>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>double</td>
                    <td>
                        <code>5.0 * 2.0</code> evaluates to <code>10.0</code>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>int</td>
                    <td>
                        <code>5.0 * 2</code> evaluates to <code>10.0</code>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>long</td>
                    <td>
                        <code>1.7 * 6666666667</code> evaluates to <code>11333333333.9</code>
                    </td>
                </tr>
            </table>
        </div>
        <h4><a id="op-num-divide" />4.2.4 Divide</h4>
        <h5>Summary</h5>
        <p>
            Returns the arithmetic quotient of its operands.
        </p>
        <h5>Operands</h5>
        <div class="table">
            <table>
                <colgroup>
                    <col />
                    <col />
                    <col />
                </colgroup>
                <tr>
                    <th>
                        Left Operand</th>
                    <th>
                        Right Operand</th>
                    <th>
                        Example</th>
                </tr>
                <tr>
                    <td>int</td>
                    <td>int</td>
                    <td>
                        <code>10 / 2</code> evaluates to <code>5</code>
                    </td>
                </tr>
                <tr>
                    <td>int</td>
                    <td>long</td>
                    <td>
                        <code>10 / 10000000000</code> evaluates to <code>0.000000001</code>
                    </td>
                </tr>
                <tr>
                    <td>int</td>
                    <td>double</td>
                    <td>
                        <code>8 / 2.0</code> evaluates to <code>4.0</code>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>long</td>
                    <td>
                        <code>13333333334 / 6666666667</code> evaluates to <code>2</code>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>int</td>
                    <td>
                        <code>13333333334 / 2</code> evaluates to <code>6666666667</code>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>double</td>
                    <td>
                        <code>13333333334 / 2.0</code> evaluates to <code>6666666667.0</code>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>double</td>
                    <td>
                        <code>9.0 / 2.0</code> evaluates to <code>4.5</code>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>int</td>
                    <td>
                        <code>6.0 / 3</code> evaluates to <code>2.0</code>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>long</td>
                    <td>
                        <code>20000000000.0 / 10000000000</code> evaluates to <code>2.0</code>
                    </td>
                </tr>
            </table>
        </div>
        <h5>Remarks</h5>
        <p>
            If the divisor is zero, then an error is raised.
        </p>
        <h4><a id="op-num-mod" />4.2.5 Mod</h4>
        <h5>Summary</h5>
        <p>
            Returns the remainder after dividing its first operand by its second.
        </p>
        <h5>Operands</h5>
        <div class="table">
            <table>
                <colgroup>
                    <col />
                    <col />
                    <col />
                </colgroup>
                <tr>
                    <th>
                        Left Operand</th>
                    <th>
                        Right Operand</th>
                    <th>
                        Example</th>
                </tr>
                <tr>
                    <td>int</td>
                    <td>int</td>
                    <td>
                        <code>5 % 3</code> evaluates to <code>2</code>
                    </td>
                </tr>
                <tr>
                    <td>int</td>
                    <td>long</td>
                    <td>
                        <code>10 % 6666666667</code> evaluates to <code>10</code>
                    </td>
                </tr>
                <tr>
                    <td>int</td>
                    <td>double</td>
                    <td>
                        <code>5 % 3.5</code> evaluates to <code>1.5</code>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>long</td>
                    <td>
                        <code>13333333334 % 6666666667</code> evaluates to <code>0</code>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>int</td>
                    <td>
                        <code>6666666667 % 10</code> evaluates to <code>7</code>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>double</td>
                    <td>
                        <code>6666666667 % 3.5</code> evaluates to <code>3.0</code>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>double</td>
                    <td>
                        <code>9.0 % 4.7</code> evaluates to <code>4.3</code>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>int</td>
                    <td>
                        <code>8.5 % 2</code> evaluates to <code>0.5</code>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>long</td>
                    <td>
                        <code>20000000000.0 % 6666666667</code> evaluates to <code>6666666666.0</code>
                    </td>
                </tr>
            </table>
        </div>
        <h5>Remarks</h5>
        <p>
            If the divisor is zero, then an error is raised.
        </p>
        <h4><a id="op-num-equal" />4.2.6 Equal</h4>
        <h5>Summary</h5>
        <p>
            Returns <b>true</b> if and only if the value of the first operand is equal to the 
            value of the second operand.
        </p>
        <h5>Operands</h5>
        <div class="table">
            <table>
                <colgroup>
                    <col />
                    <col />
                    <col />
                </colgroup>
                <tr>
                    <th>
                        Left Operand</th>
                    <th>
                        Right Operand</th>
                    <th>
                        Example</th>
                </tr>
                <tr>
                    <td>int</td>
                    <td>int</td>
                    <td>
                        <code>5 == 3</code> evaluates to <b>false</b>
                    </td>
                </tr>
                <tr>
                    <td>int</td>
                    <td>long</td>
                    <td>
                        <code>5 == 6666666667</code> evaluates to <b>false</b>
                    </td>
                </tr>
                <tr>
                    <td>int</td>
                    <td>double</td>
                    <td>
                        <code>6 == 6.0</code> evaluates to <b>true</b>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>long</td>
                    <td>
                        <code>6666666667 == 6666666667</code> evaluates to <b>true</b>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>int</td>
                    <td>
                        <code>6666666667 == 665</code> evaluates to <b>false</b>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>double</td>
                    <td>
                        <code>6666666667 == 6666666667.0</code> evaluates to <b>true</b>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>double</td>
                    <td>
                        <code>9.5 == 6.7</code> evaluates to <b>false</b>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>int</td>
                    <td>
                        <code>8.5 == 8</code> evaluates to <b>false</b>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>long</td>
                    <td>
                        <code>8.5 == 6666666667</code> evaluates to <b>false</b>
                    </td>
                </tr>
            </table>
        </div>
        <h4><a id="op-num-inequal" />4.2.7 Inequal</h4>
        <h5>Summary</h5>
        <p>
            Returns <b>true</b> if and only if the value of the first operand is not equal to the 
            value of the second operand.
        </p>
        <h5>Operands</h5>
        <div class="table">
            <table>
                <colgroup>
                    <col />
                    <col />
                    <col />
                </colgroup>
                <tr>
                    <th>
                        Left Operand</th>
                    <th>
                        Right Operand</th>
                    <th>
                        Example</th>
                </tr>
                <tr>
                    <td>int</td>
                    <td>int</td>
                    <td>
                        <code>5 != 3</code> evaluates to <b>true</b>
                    </td>
                </tr>
                <tr>
                    <td>int</td>
                    <td>long</td>
                    <td>
                        <code>5 != 6666666667</code> evaluates to <b>true</b>
                    </td>
                </tr>
                <tr>
                    <td>int</td>
                    <td>double</td>
                    <td>
                        <code>6 != 6.0</code> evaluates to <b>false</b>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>long</td>
                    <td>
                        <code>6666666667 != 6666666667</code> evaluates to <b>false</b>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>int</td>
                    <td>
                        <code>6666666667 != 665</code> evaluates to <b>true</b>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>double</td>
                    <td>
                        <code>6666666667 != 6666666667.0</code> evaluates to <b>false</b>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>double</td>
                    <td>
                        <code>9.5 != 6.7</code> evaluates to <b>true</b>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>int</td>
                    <td>
                        <code>8.5 != 8</code> evaluates to <b>true</b>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>long</td>
                    <td>
                        <code>8.5 != 6666666667</code> evaluates to <b>true</b>
                    </td>
                </tr>
            </table>
        </div>
        <h4><a id="op-num-greater-than" />4.2.8 Greater than</h4>
        <h5>Summary</h5>
        <p>
            Returns <b>true</b> if and only if the first operand is greater than the 
            second operand.
        </p>
        <h5>Operands</h5>
        <div class="table">
            <table>
                <colgroup>
                    <col />
                    <col />
                    <col />
                </colgroup>
                <tr>
                    <th>
                        Left Operand</th>
                    <th>
                        Right Operand</th>
                    <th>
                        Example</th>
                </tr>
                <tr>
                    <td>int</td>
                    <td>int</td>
                    <td>
                        <code>5 > 3</code> evaluates to <b>false</b>
                    </td>
                </tr>
                <tr>
                    <td>int</td>
                    <td>long</td>
                    <td>
                        <code>5 > 6666666667</code> evaluates to <b>false</b>
                    </td>
                </tr>
                <tr>
                    <td>int</td>
                    <td>double</td>
                    <td>
                        <code>6 > 4.0</code> evaluates to <b>true</b>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>long</td>
                    <td>
                        <code>6666666667 > 6666666667</code> evaluates to <b>false</b>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>int</td>
                    <td>
                        <code>6666666667 > 665</code> evaluates to <b>true</b>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>double</td>
                    <td>
                        <code>6666666667 > 6666666667.0</code> evaluates to <b>false</b>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>double</td>
                    <td>
                        <code>9.5 > 9.5</code> evaluates to <b>false</b>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>int</td>
                    <td>
                        <code>8.3 > 9</code> evaluates to <b>false</b>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>long</td>
                    <td>
                        <code>8.5 > 6666666667</code> evaluates to <b>false</b>
                    </td>
                </tr>
            </table>
        </div>
        <h4><a id="op-num-greater-than-or-equal" />4.2.9 Greater than or equal</h4>
        <h5>Summary</h5>
        <p>
            Returns <b>true</b> if and only if the first operand is greater than or 
            equal to second operand.
        </p>
        <h5>Operands</h5>
        <div class="table">
            <table>
                <colgroup>
                    <col />
                    <col />
                    <col />
                </colgroup>
                <tr>
                    <th>
                        Left Operand</th>
                    <th>
                        Right Operand</th>
                    <th>
                        Example</th>
                </tr>
                <tr>
                    <td>int</td>
                    <td>int</td>
                    <td>
                        <code>5 >= 3</code> evaluates to <b>false</b>
                    </td>
                </tr>
                <tr>
                    <td>int</td>
                    <td>long</td>
                    <td>
                        <code>5 >= 6666666667</code> evaluates to <b>false</b>
                    </td>
                </tr>
                <tr>
                    <td>int</td>
                    <td>double</td>
                    <td>
                        <code>6 >= 4.0</code> evaluates to <b>true</b>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>long</td>
                    <td>
                        <code>6666666667 >= 6666666667</code> evaluates to <b>true</b>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>int</td>
                    <td>
                        <code>6666666667 >= 665</code> evaluates to <b>true</b>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>double</td>
                    <td>
                        <code>6666666667 >= 6666666667.0</code> evaluates to <b>true</b>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>double</td>
                    <td>
                        <code>9.5 >= 9.5</code> evaluates to <b>true</b>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>int</td>
                    <td>
                        <code>8.3 >= 9</code> evaluates to <b>false</b>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>long</td>
                    <td>
                        <code>8.5 >= 6666666667</code> evaluates to <b>false</b>
                    </td>
                </tr>
            </table>
        </div>
        <h4><a id="op-num-less-than" />4.2.10 Less than</h4>
        <h5>Summary</h5>
        <p>
            Returns <b>true</b> if and only if the first operand is less than the 
            second operand.
        </p>
        <h5>Operands</h5>
        <div class="table">
            <table>
                <colgroup>
                    <col />
                    <col />
                    <col />
                </colgroup>
                <tr>
                    <th>
                        Left Operand</th>
                    <th>
                        Right Operand</th>
                    <th>
                        Example</th>
                </tr>
                <tr>
                    <td>int</td>
                    <td>int</td>
                    <td>
                        <code>5 &lt; 3</code> evaluates to <b>false</b>
                    </td>
                </tr>
                <tr>
                    <td>int</td>
                    <td>long</td>
                    <td>
                        <code>5 &lt; 6666666667</code> evaluates to <b>true</b>
                    </td>
                </tr>
                <tr>
                    <td>int</td>
                    <td>double</td>
                    <td>
                        <code>6 &lt; 7.0</code> evaluates to <b>true</b>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>long</td>
                    <td>
                        <code>6666666667 &lt; 6666666667</code> evaluates to <b>false</b>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>int</td>
                    <td>
                        <code>6666666667 &lt; 665</code> evaluates to <b>false</b>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>double</td>
                    <td>
                        <code>6666666667 &lt; 6666666667.0</code> evaluates to <b>false</b>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>double</td>
                    <td>
                        <code>9.5 &lt; 9.5</code> evaluates to <b>false</b>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>int</td>
                    <td>
                        <code>8.3 &lt; 9</code> evaluates to <b>true</b>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>long</td>
                    <td>
                        <code>8.5 &lt; 6666666667</code> evaluates to <b>true</b>
                    </td>
                </tr>
            </table>
        </div>
        <h4><a id="op-num-less-than-or-equal" />4.2.11 Less than or equal</h4>
        <h5>Summary</h5>
        <p>
            Returns <b>true</b> if and only if the first operand is less than or 
            equal to second operand.
        </p>
        <h5>Operands</h5>
        <div class="table">
            <table>
                <colgroup>
                    <col />
                    <col />
                    <col />
                </colgroup>
                <tr>
                    <th>
                        Left Operand</th>
                    <th>
                        Right Operand</th>
                    <th>
                        Example</th>
                </tr>
                <tr>
                    <td>int</td>
                    <td>int</td>
                    <td>
                        <code>5 &lt;= 3</code> evaluates to <b>false</b>
                    </td>
                </tr>
                <tr>
                    <td>int</td>
                    <td>long</td>
                    <td>
                        <code>5 &lt;= 6666666667</code> evaluates to <b>true</b>
                    </td>
                </tr>
                <tr>
                    <td>int</td>
                    <td>double</td>
                    <td>
                        <code>6 &lt;= 7.0</code> evaluates to <b>true</b>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>long</td>
                    <td>
                        <code>6666666667 &lt;= 6666666667</code> evaluates to <b>true</b>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>int</td>
                    <td>
                        <code>6666666667 &lt;= 665</code> evaluates to <b>false</b>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>double</td>
                    <td>
                        <code>6666666667 &lt;= 6666666667.0</code> evaluates to <b>true</b>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>double</td>
                    <td>
                        <code>9.5 &lt;= 9.5</code> evaluates to <b>true</b>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>int</td>
                    <td>
                        <code>8.3 &lt;= 9</code> evaluates to <b>true</b>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>long</td>
                    <td>
                        <code>8.5 &lt;= 6666666667</code> evaluates to <b>true</b>
                    </td>
                </tr>
            </table>
        </div>
        <h4><a id="op-num-unary-plus" />4.2.12 Unary plus</h4>
        <h5>Summary</h5>
        <p>
            Returns its operand with the sign unchanged. Semantically, this operation 
            performs no operation.
        </p>
        <h5>Operands</h5>
        <div class="table">
            <table>
                <colgroup>
                    <col />
                    <col />
                    <col />
                </colgroup>
                <tr>
                    <th>
                        Operand</th>
                    <th>
                        Example</th>
                </tr>
                <tr>
                    <td>int</td>
                    <td>
                        <code>(+1)</code> evaluates to <code>1</code>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>
                        <code>(+6666666667)</code> evaluates to <code>6666666667</code>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>
                        <code>(+1.5)</code> evaluates to <code>1.5</code>
                    </td>
                </tr>
            </table>
        </div>
        <h4><a id="op-num-unary-minus" />4.2.13 Unary minus</h4>
        <h5>Summary</h5>
        <p>
            Returns its operand with the sign reversed.
        </p>
        <p>
            If the operand is positive, its negative is returned; if it is negative, its 
            positive is returned.
        </p>
        <h5>Operands</h5>
        <div class="table">
            <table>
                <colgroup>
                    <col />
                    <col />
                    <col />
                </colgroup>
                <tr>
                    <th>
                        Operand</th>
                    <th>
                        Example</th>
                </tr>
                <tr>
                    <td>int</td>
                    <td>
                        <code>(-1)</code> evaluates to <code>-1</code>
                    </td>
                </tr>
                <tr>
                    <td>long</td>
                    <td>
                        <code>(-6666666667)</code> evaluates to <code>-6666666667</code>
                    </td>
                </tr>
                <tr>
                    <td>double</td>
                    <td>
                        <code>(-9.6)</code> evaluates to <code>-9.6</code>
                    </td>
                </tr>
            </table>
        </div>
        <h3><a id="boolean-operators" />4.3 Operators on Boolean Values</h3>
        <p>The following operators are supported on boolean values:</p>
        <ul>
            <li>
                == operator
            </li>
            <li>
                != operator
            </li>
            <li>
                > operator
            </li>
            <li>
                >= operator
            </li>
            <li>
                &lt; operator
            </li>
            <li>
                &lt;= operator
            </li>          
            <li>
            	and operator
            </li>
            <li>
            	or operator
            </li>
        </ul>
        <h4><a id="op-boolean-equal" />4.3.1 Equal</h4>
        <h5>Summary</h5>
        <p>
            Returns <b>true</b> if both operands are <b>true</b> or if both 
            operands are <b>false</b>.
        </p>
        <h5>Examples</h5>
        <h4><a id="op-boolean-inequal" />4.3.2 Inequal</h4>
        <h5>Summary</h5>
        <p>
            Returns <b>true</b> if the first operand is <b>true</b> and the 
            second operand is <b>false</b>, or the first operand is <b>false</b>
            and the second operand is <b>true</b>.
        </p>
        <h5>Examples</h5>
        <h4><a id="op-boolean-greater-than" />4.3.3 Greater than</h4>
        <h5>Summary</h5>
        <p>
            Returns <b>true</b> if the first operand is <b>true</b> and the 
            second operand is <b>false</b>; otherwise, returns <b>false</b>.
        </p>
        <h5>Examples</h5>
        <h4><a id="op-boolean-greater-than-or-equal" />4.3.4 Greater than or equal</h4>
        <h5>Summary</h5>
        <p>
            Returns <b>true</b> if the first operand is <b>true</b> and the 
            second operand is <b>false</b>, or both operands are either <b>true</b>
            or <b>false</b>.
        </p>
        <h5>Examples</h5>
        <h4><a id="op-boolean-less-than" />4.3.5 Less than</h4>
        <h5>Summary</h5>
        <p>
            Returns <b>true</b> if the first operand is <b>false</b> and the 
            second operand is <b>true</b>; otherwise, returns <b>false</b>.
        </p>
        <h5>Examples</h5>
        <h4><a id="op-boolean-less-than-or-equal" />4.3.6 Less than or equal</h4>
        <h5>Summary</h5>
        <p>
            Returns <b>true</b> if the first operand is <b>false</b> and the 
            second operand is <b>true</b>, or both operands are either <b>true</b>
            or <b>false</b>.
        </p>
        <h5>Examples</h5>
        <h4><a id="op-boolean-logical-and" />4.3.7 Logical and</h4>
        <h5>Summary</h5>
        <p>
        	Returns <b>true</b> if both operands are <b>true</b>,
        	otherwise returns <b>false</b>.
        </p>                                                                       
        <h5>Examples</h5>
        <p>
        	<code>&lt;if test=&quot;${A and B}&quot;&gt;</code> 
        	
        </p>                                     
        <h4><a id="op-boolean-logical-or" />4.3.8 Logical or</h4>
        <h5>Summary</h5>
        <p>
        	Returns <b>true</b> if either operand is <b>true</b>, 
        	otherwise returns <b>false</b>.
        </p>                                                                       
        <h5>Examples</h5>
        <p>
        	<code>&lt;if test=&quot;${A or B}&quot;&gt;</code>        	
        </p>
        <h3><a id="string-operators" />4.4 Operators on String Values</h3>
        <p>The following operators are supported on string values:</p>
        <ul>
            <li>
                + operator
            </li>
            <li>
                == operator
            </li>
            <li>
                != operator
            </li>
            <li>
                > operator
            </li>
            <li>
                >= operator
            </li>
            <li>
                &lt; operator
            </li>
            <li>
                &lt;= operator
            </li>
        </ul>                
        <h4><a id="op-string-concat" />4.4.1 Concat</h4>
        <h5>Summary</h5>
        <p>
            Returns the concatenation of both string operands.
        </p>
        <h5>Examples</h5>
        <h4><a id="op-string-equal" />4.4.2 Equal</h4>
        <h5>Summary</h5>
        <p>
            Returns <b>true</b> if the value of the left operand is the same as the 
            value of the right operand.
        </p>
        <h5>Remarks</h5>
        <p>
            The comparison is case-sensitive and culture-insensitive.
        </p>
        <h4><a id="op-string-inequal" />4.4.3 Inequal</h4>
        <h5>Summary</h5>
        <p>
            Returns <b>true</b> if the value of the first operand is not the same as 
            the value of the second operand.
        </p>
        <h5>Remarks</h5>
        <p>
            The comparison is case-sensitive and culture-insensitive.
        </p>
        <h4><a id="op-string-greater-than" />4.4.4 Greater than</h4>
        <h5>Summary</h5>
        <p>
            Returns <b>true</b> if the first operand is greater than the seconds 
            operand.
        </p>
        <h5>Remarks</h5>
        <p>
            The comparison is case-sensitive and culture-insensitive.
        </p>
        <h4><a id="op-string-greater-than-or-equal" />4.4.5 Greater than or equal</h4>
        <h5>Summary</h5>
        <p>
            Returns <b>true</b> if the first operand is greater than or equal to the 
            seconds operand.
        </p>
        <h5>Remarks</h5>
        <p>
            The comparison is case-sensitive and culture-insensitive.
        </p>
        <h4><a id="op-string-less-than" />4.4.6 Less than</h4>
        <h5>Summary</h5>
        <p>
            Returns <b>true</b> if the first operand is less than the seconds 
            operand.
        </p>
        <h5>Remarks</h5>
        <p>
            The comparison is case-sensitive and culture-insensitive.
        </p>
        <h4><a id="op-string-less-than-or-equal" />4.4.7 Less than or equal</h4>
        <h5>Summary</h5>
        <p>
            Returns <b>true</b> if the first operand is less than or equal to the 
            seconds operand.
        </p>
        <h5>Remarks</h5>
        <p>
            The comparison is case-sensitive and culture-insensitive.
        </p>
        <h3><a id="datetime-operators" />4.5 Operators on TimeSpan and DateTime Values</h3>
        <p>The following operators are supported on timespan and datetime values:</p>
        <ul>
            <li>
                + operator
            </li>
            <li>
                - operator
            </li>
            <li>
                == operator
            </li>
            <li>
                != operator
            </li>
            <li>
                > operator
            </li>
            <li>
                >= operator
            </li>
            <li>
                &lt; operator
            </li>
            <li>
                &lt;= operator
            </li>
        </ul>
        <h4><a id="op-datetime-add" />4.5.1 Add</h4>
        <h5>Summary</h5>
        <p>
            Returns the result of adding the value of the left operand to the value of the 
            right operand.
        </p>
        <h5>Operands</h5>
        <div class="table">
            <table>
                <colgroup>
                    <col />
                    <col />
                    <col />
                </colgroup>
                <tr>
                    <th>
                        Left Operand</th>
                    <th>
                        Right Operand</th>
                    <th>
                        Example</th>
                </tr>
                <tr>
                    <td>datetime</td>
                    <td>timespan</td>
                    <td>
                        <code>datetime::now() + timespan::from-days(10)</code> 
                        evaluates to a datetime 10 days in the future
                    </td>
                </tr>
                <tr>
                    <td>timespan</td>
                    <td>timespan</td>
                    <td>
                        <code>timespan::from-seconds(30) + timespan::from-minutes(10)</code> 
                        evaluates to a timespan representing a duratio of 10 minutes and 30 
                        seconds
                    </td>
                </tr>
            </table>
        </div>
        <h4><a id="op-datetime-subtract" />4.5.2 Subtract</h4>
        <h5>Summary</h5>
        <p>
            Returns the result of subtracting the value of the right operand 
            from the value of the left operand.
        </p>
        <h5>Operands</h5>
        <div class="table">
            <table>
                <colgroup>
                    <col />
                    <col />
                    <col />
                </colgroup>
                <tr>
                    <th>
                        Left Operand</th>
                    <th>
                        Right Operand</th>
                    <th>
                        Example</th>
                </tr>
                <tr>
                    <td>datetime</td>
                    <td>datetime</td>
                    <td>
                        <code>(datetime::now() + timespan::from-days(10)) - datetime::now</code> 
                        evaluates to a timespan representing a duration of 10 days
                    </td>
                </tr>
                <tr>
                    <td>datetime</td>
                    <td>timespan</td>
                    <td>
                        <code>timespan::from-seconds(30) - timespan::from-seconds(10)</code> evaluates 
                        to a timespan representing a duration of 20 seconds
                    </td>
                </tr>
                <tr>
                    <td>timespan</td>
                    <td>timespan</td>
                    <td>
                        <code>timespan::from-seconds(30) + timespan::from-minutes(10)</code> evaluates 
                        to a timespan representing 10 minutes and 30 seconds
                    </td>
                </tr>
            </table>
        </div>
        <h4><a id="op-datetime-equal" />4.5.3 Equal</h4>
        <h5>Summary</h5>
        <p>
            Returns <b>true</b> if the value of the left operand is the same as the 
            value of the right operand.
        </p>
        <h5>Operands</h5>
        <div class="table">
            <table>
                <colgroup>
                    <col />
                    <col />
                    <col />
                </colgroup>
                <tr>
                    <th>
                        Left Operand</th>
                    <th>
                        Right Operand</th>
                    <th>
                        Example</th>
                </tr>
                <tr>
                    <td>datetime</td>
                    <td>datetime</td>
                    <td>
                        <code>datetime::now() == (datetime::now()+timespan::from-days(10))</code> evaluates 
                        to <b>false</b>
                    </td>
                </tr>
                <tr>
                    <td>timespan</td>
                    <td>timespan</td>
                    <td>
                        <code>timespan::from-seconds(30) == timespan::from-seconds(30)</code> evaluates 
                        to <b>true</b>
                    </td>
                </tr>
            </table>
        </div>
        <h4><a id="op-datetime-inequal" />4.5.4 Inequal</h4>
        <h5>Summary</h5>
        <p>
            Returns <b>true</b> if the value of the left operand is not the same as 
            the value of the right operand.
        </p>
        <h5>Operands</h5>
        <div class="table">
            <table>
                <colgroup>
                    <col />
                    <col />
                    <col />
                </colgroup>
                <tr>
                    <th>
                        Left Operand</th>
                    <th>
                        Right Operand</th>
                    <th>
                        Example</th>
                </tr>
                <tr>
                    <td>datetime</td>
                    <td>datetime</td>
                    <td>
                        <code>datetime::now() != (datetime::now()+timespan::from-days(10))</code> evaluates 
                        to <b>true</b>
                    </td>
                </tr>
                <tr>
                    <td>timespan</td>
                    <td>timespan</td>
                    <td>
                        <code>timespan::from-seconds(30) != timespan::from-seconds(30)</code> evaluates 
                        to <b>false</b>
                    </td>
                </tr>
            </table>
        </div>
        <h4><a id="op-datetime-greater-than" />4.5.5 Greater than</h4>
        <h5>Summary</h5>
        <p>
            Returns <b>true</b> if the value of the left operand is greater than the 
            value of the right operand.
        </p>
        <h5>Operands</h5>
        <div class="table">
            <table>
                <colgroup>
                    <col />
                    <col />
                    <col />
                </colgroup>
                <tr>
                    <th>
                        Left Operand</th>
                    <th>
                        Right Operand</th>
                    <th>
                        Example</th>
                </tr>
                <tr>
                    <td>datetime</td>
                    <td>datetime</td>
                    <td>
                        <code>datetime::now() > (datetime::now()+timespan::from-days(10))</code> evaluates 
                        to <b>false</b>
                    </td>
                </tr>
                <tr>
                    <td>timespan</td>
                    <td>timespan</td>
                    <td>
                        <code>timespan::from-seconds(30) > timespan::from-seconds(30)</code> evaluates 
                        to <b>false</b>
                    </td>
                </tr>
            </table>
        </div>
        <h4><a id="op-datetime-greater-than-or-equal" />4.5.6 Greater than or equal</h4>
        <h5>Summary</h5>
        <p>
            Returns <b>true</b> if the value of the left operand is greater than or 
            equal to the value of the right operand.
        </p>
        <h5>Operands</h5>
        <div class="table">
            <table>
                <colgroup>
                    <col />
                    <col />
                    <col />
                </colgroup>
                <tr>
                    <th>
                        Left Operand</th>
                    <th>
                        Right Operand</th>
                    <th>
                        Example</th>
                </tr>
                <tr>
                    <td>datetime</td>
                    <td>datetime</td>
                    <td>
                        <code>datetime::now() >= (datetime::now()+timespan::from-days(10))</code> evaluates 
                        to <b>false</b>
                    </td>
                </tr>
                <tr>
                    <td>timespan</td>
                    <td>timespan</td>
                    <td>
                        <code>timespan::from-seconds(30) >= timespan::from-seconds(30)</code> evaluates 
                        to <b>false</b>
                    </td>
                </tr>
            </table>
        </div>
        <h4><a id="op-datetime-less-than" />4.5.7 Less than</h4>
        <h5>Summary</h5>
        <p>
            Returns <b>true</b> if the value of the left operand is less than the 
            value of the right operand.
        </p>
        <h5>Operands</h5>
        <div class="table">
            <table>
                <colgroup>
                    <col />
                    <col />
                    <col />
                </colgroup>
                <tr>
                    <th>
                        Left Operand</th>
                    <th>
                        Right Operand</th>
                    <th>
                        Example</th>
                </tr>
                <tr>
                    <td>datetime</td>
                    <td>datetime</td>
                    <td>
                        <code>datetime::now() &lt; (datetime::now()+timespan::from-days(10))</code> evaluates 
                        to <b>true</b>
                    </td>
                </tr>
                <tr>
                    <td>timespan</td>
                    <td>timespan</td>
                    <td>
                        <code>timespan::from-seconds(30) &lt; timespan::from-seconds(30)</code> evaluates 
                        to <b>false</b>
                    </td>
                </tr>
            </table>
        </div>
        <h4><a id="op-datetime-less-than-or-equal" />4.5.8 Less than or equal</h4>
        <h5>Summary</h5>
        <p>
            Returns <b>true</b> if the value of the left operand is less than the 
            value of the right operand.
        </p>
        <h5>Operands</h5>
        <div class="table">
            <table>
                <colgroup>
                    <col />
                    <col />
                    <col />
                </colgroup>
                <tr>
                    <th>
                        Left Operand</th>
                    <th>
                        Right Operand</th>
                    <th>
                        Example</th>
                </tr>
                <tr>
                    <td>datetime</td>
                    <td>datetime</td>
                    <td>
                        <code>datetime::now() &lt;= (datetime::now()+timespan::from-days(10))</code> evaluates 
                        to <b>false</b>
                    </td>
                </tr>
                <tr>
                    <td>timespan</td>
                    <td>timespan</td>
                    <td>
                        <code>timespan::from-seconds(30) &lt;= timespan::from-seconds(30)</code> evaluates 
                        to <b>true</b>
                    </td>
                </tr>
            </table>
        </div>
    </body>
</html>
